i think you are being too hard on yourself... i think for a first attempt it's very good, and honestly if i saw that somewhere displayed i would stop to admire it... the only one thing that pops out at me is the grass... a little too big for the scene... the lighter lime color in it a bit stark... perhaps you could try using a darker green pigma pen to tone it if you wanted too...there is too much good work here to be unhappy and not finish it